Radio antenna



V. M. WINTERMUTE May 24, 1949.

RADIO ANTENNA Filed May 22, 1948 Patented May 24, 1949 RADIO ANTENNAVern M. Wintermute, North Plainfield, N. J.,. as-

signor to Lyte Parts Company, Plainfield, N. J a corporation of NewJersey Application May 22, 1948; Serial No. 28,712

1 Claim. 1

Thisinvention relates to improvements in antenna structures. It isparticularly directed to an improved antenna for the reception ofsignals of frequencies associated with" television and frequencymodulation broadcasting.

It is the primary object of the present invention to provide an antennawhich will accommodate all of the presently designated televisionchannels and frequency modulation bands.

A further object of my invention is to provide a directional dipoleantenna arranged for the higher frequencies and lower frequencies intelevision broadcasting, with which is associated a novel and usefulreflector assembly.

A still further object of my invention is to provide an antenna fortelevision and frequency modulation signals which is complete with allnecessary parts, which will give trouble-free service, and which isarranged for ready installation on a suitable antenna mast.

The antenna of the present invention is similar in some respects to thatwhich is shown in an earlier application, Serial Number 20,618, forTelevision antenna, filed April 13, 1948; in which application I am aco-inventor with George E.

Zellinek, now abandoned.

In the drawings,

Figure 1 is a perspective view showing the antenna structure of myinvention supported on an antenna mast, shown fragmentarily, and

Figure 2 is a cross-section view taken on the lines 2-2 of Figure 1.

Referring to the two views of the drawing, the antenna of my inventionincludes a pair of reversely folded tubular conducting metal dipoleelements it, coplanar in part with respect to each other on anelectrical insulating panel II, the latter of which is affixed by meansof a flat bracket I2 to one end of a horizontal tubular cross-arm orstand-off tube I3. Cross-arm i3 is, in turn, pivotably fixed to the topend of a suitable antenna mast I4, as by the use of T bracket I5 locatedapproximately midway of the length of the cross-arm. A reflectorassembly designated generally at I6 is affixed to the end of thecross-arm I3 opposite to that of the dipole assembly.

The folded dipole loops Iil are engaged by and held in rolled edges ofthin flat sheet metal mounting plates II for fastening with machinescrews, to panel H, and they are of suitable combined length for optimumreception of signals in the lower frequency channels assigned totelevision and to frequency modulation in the frequency range between 44and 108 megacycles.

Loops II] are, additionally, angularly bent and staggered whereby theirfree, inwardly directed, open ends cross each other infront. of panel-II to form, in efiect, a V type antenna for the reception of signals inthe higher frequency television channels in the frequency range between174 and 216 megacycles. Separation of the free open ends of loops I0 ismaintained by the engagement therewith of suitable strips of insulatingmaterial l8.

Three parallel tubular multiple piece metallic reflector rods 20, 2D,and 20 constitute the principal elements of the rejector assembly I6,which rods are centrally secured to a bracket l2 fixed to the end ofcross-arm I3. The rehector elements are co-planar and horizontallydisposed corresponding in elevation with the dipole; and it will benoted that they are graduated in length with the longest rod 20 in thetopmost position. Stability for the free ends of the reflector rods ismaintained with insulating strips M which are drilled to fit over therods and serve to tie them together and thus assist in preventingsagging and bending.

I prefer to make the folded dipole of a length which is approximatelyone-half wavelength at the geometric center of the lower frequencytelevision band, and of suitable proportion so that I avoid any sharppeaks in a curve of signal response of my antenna compared with a tuneddipole. For the higher frequency channels, the combined length of thelegs of the V corresponds approximately to one half wavelength at thegeometric center of the band. The reflectors 20, 2B and 20 may eachcorrespond in length to one half wavelength in a particular lowerfrequency channel, as for example in channels number 4, 5, and 6. Thus,as will be understood by those skilled in the art, I obtain maximumsignal response over the range where it is most desired.

Transmission line lead-in wiring 25 of suitable characteristics is used,preferably comprising a co-axial cable and matching stub, with theshield of the co-axial cable terminating in the mounting plate I I forthe dipole element on the left hand side and the hot wire of theco-axial cable crossing over for termination with the matching stub inthe mounting plate I! for the right hand dipole element. An insulator 26fastened to the depending end of bracket I2 and a second insulator 26'serve to position and insulate the cable and the matching stub as thewiring is directed downwardly from the antenna, and suitable provisionis made immediately below insulator 26' to ground the shield of theco-axial cable and the matching stub to the antenna mast.

It will be appreciated by those who are skilled in the art that certainoptional or necessary changes in the arrangement of parts and in theirspecifications may be substituted for those illustrated, depending uponthe type and specifications of the receiving set with which my improvedantenna is used. I do not, therefore, wish that the invention be limitedto the specific apparatus other than as particularly pointed out in thesubjoined claim.

Having thus described my invention in a preferred embodiment of theprinciples thereof, I claim:

In an antenna for the reception of television signals or the like, incombination, a pair of antenna elements; each element consisting of alinear conductor folded back on itself to provide a pair of parallellegs having a closed end and an open end and angularly formed so thatthe closed end with a substantial portion of the linear conductor liesin one plane While the open end and a substantial portion of theremainder of the conductor lies in an intersecting plane, the

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Name Date Carter Mar. 7, 1939 OTHER REFERENCESTele-Tech for March 1947, pp. 58-62.

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